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class="sidebar-link">属性合并</a></li></ul></li><li><a href="/front/vue/vue/08.html" class="sidebar-link">组件的渲染</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/front/vue/vue/08.html#创建组件的虚拟节点" class="sidebar-link">创建组件的虚拟节点</a></li><li class="sidebar-sub-header"><a href="/front/vue/vue/08.html#创建组件的真实节点" class="sidebar-link">创建组件的真实节点</a></li></ul></li><li><a href="/front/vue/vue/09.html" class="sidebar-link">diff算法</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/front/vue/vue/09.html#diff算法初相识" class="sidebar-link">diff算法初相识</a></li><li class="sidebar-sub-header"><a href="/front/vue/vue/09.html#diff中的优化策略" class="sidebar-link">diff中的优化策略</a></li><li class="sidebar-sub-header"><a href="/front/vue/vue/09.html#乱序diff算法" class="sidebar-link">乱序diff算法</a></li></ul></li><li><a href="/front/vue/vue/10.html" class="sidebar-link">watch方法</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/front/vue/vue/10.html#watch方法的实现" class="sidebar-link">watch方法的实现</a></li></ul></li><li><a href="/front/vue/vue/11.html" class="sidebar-link">计算属性</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/front/vue/vue/11.html#计算属性的实现" class="sidebar-link">计算属性的实现</a></li><li class="sidebar-sub-header"><a href="/front/vue/vue/11.html#计算属性的依赖收集" class="sidebar-link">计算属性的依赖收集</a></li></ul></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h2 id="初始化渲染watcher"><a href="#初始化渲染watcher" class="header-anchor">#</a> 初始化渲染Watcher</h2> <div class="language-js extra-class"><div class="highlight-lines"><br><br><div class="highlighted"> </div><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><div class="highlighted"> </div><br><br><br></div><pre class="language-js"><code><span class="token comment">// src/init.js</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> compileToFunctions <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./compiler/index'</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> mountComponent <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./lifeCycle'</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> initState <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./state'</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">initMixin</span><span class="token punctuation">(</span><span class="token parameter">Vue</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token class-name">Vue</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">_init</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">options</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">const</span> vm <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
		vm<span class="token punctuation">.</span>$options <span class="token operator">=</span> options<span class="token punctuation">;</span> <span class="token comment">// 实例上有个属性$options表示的是用户传入的属性，可以通过vm.$options获取到用户传入的所有属性</span>

		<span class="token comment">// 初始化状态</span>
		<span class="token function">initState</span><span class="token punctuation">(</span>vm<span class="token punctuation">)</span><span class="token punctuation">;</span>

		<span class="token comment">// 有el属性的话，说明数据可以挂在到页面上</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span>vm<span class="token punctuation">.</span>$options<span class="token punctuation">.</span>el<span class="token punctuation">)</span> <span class="token punctuation">{</span>
			vm<span class="token punctuation">.</span><span class="token function">$mount</span><span class="token punctuation">(</span>vm<span class="token punctuation">.</span>$options<span class="token punctuation">.</span>el<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
	<span class="token class-name">Vue</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">$mount</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">el</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">const</span> vm <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
		<span class="token keyword">const</span> options <span class="token operator">=</span> vm<span class="token punctuation">.</span>$options<span class="token punctuation">;</span>
		el <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span>el<span class="token punctuation">)</span><span class="token punctuation">;</span>

		<span class="token comment">// 如果有render就直接用render，没有render，看看有没有template属性，如果也没有template属性的话，就直接找外部模板</span>
		<span class="token comment">// 如果没有render方法</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>options<span class="token punctuation">.</span>render<span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token keyword">let</span> template <span class="token operator">=</span> options<span class="token punctuation">.</span>template<span class="token punctuation">;</span>
			<span class="token comment">// 如果没有模板但是有el</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>template <span class="token operator">&amp;&amp;</span> el<span class="token punctuation">)</span> <span class="token punctuation">{</span>
				template <span class="token operator">=</span> el<span class="token punctuation">.</span>outerHTML<span class="token punctuation">;</span>
			<span class="token punctuation">}</span>
			<span class="token comment">// 将模板编译成render函数</span>
			<span class="token keyword">const</span> render <span class="token operator">=</span> <span class="token function">compileToFunctions</span><span class="token punctuation">(</span>template<span class="token punctuation">)</span><span class="token punctuation">;</span>
			options<span class="token punctuation">.</span>render <span class="token operator">=</span> render<span class="token punctuation">;</span>
			console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'render'</span><span class="token punctuation">,</span> render<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>

		<span class="token function">mountComponent</span><span class="token punctuation">(</span>vm<span class="token punctuation">,</span> el<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 组件挂载</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// src/lifeCycle.js</span>
<span class="token keyword">import</span> Watcher <span class="token keyword">from</span> <span class="token string">&quot;./observer/watcher&quot;</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">lifecycleMixin</span><span class="token punctuation">(</span><span class="token parameter">Vue</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token class-name">Vue</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">_update</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">vnode</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'_udpate'</span><span class="token punctuation">,</span> vnode<span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">mountComponent</span><span class="token punctuation">(</span><span class="token parameter">vm<span class="token punctuation">,</span> el</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token comment">// 默认 vue 通过 watcher 来渲染，这个watcher可以叫做渲染watcher，每个组件都有一个渲染watcher</span>
	vm<span class="token punctuation">.</span>$el <span class="token operator">=</span> el<span class="token punctuation">;</span>
	<span class="token keyword">let</span> <span class="token function-variable function">updateComponent</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
		<span class="token comment">// 将虚拟节点 渲染到页面上</span>
    <span class="token comment">// vm._render() 返回虚拟节点</span>
    <span class="token comment">// vm._update() 将虚拟节点转换成真实节点</span>
		vm<span class="token punctuation">.</span><span class="token function">_update</span><span class="token punctuation">(</span>vm<span class="token punctuation">.</span><span class="token function">_render</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
	<span class="token keyword">new</span> <span class="token class-name">Watcher</span><span class="token punctuation">(</span>vm<span class="token punctuation">,</span> updateComponent<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token comment">// 回调函数</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// true 表示这是一个渲染watcher</span>
<span class="token punctuation">}</span>
</code></pre></div><div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// src/observer/watcher.js</span>
<span class="token comment">// id用于标识不同组件不同的watcher</span>
<span class="token keyword">let</span> id <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">Watcher</span> <span class="token punctuation">{</span>
	<span class="token function">constructor</span><span class="token punctuation">(</span><span class="token parameter">vm<span class="token punctuation">,</span> exprOrFn<span class="token punctuation">,</span> cb<span class="token punctuation">,</span> options</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">this</span><span class="token punctuation">.</span>vm <span class="token operator">=</span> vm<span class="token punctuation">;</span>
		<span class="token keyword">this</span><span class="token punctuation">.</span>exprOrFn <span class="token operator">=</span> exprOrFn<span class="token punctuation">;</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> exprOrFn <span class="token operator">==</span> <span class="token string">'function'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token keyword">this</span><span class="token punctuation">.</span>getter <span class="token operator">=</span> exprOrFn<span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
		<span class="token keyword">this</span><span class="token punctuation">.</span>cb <span class="token operator">=</span> cb<span class="token punctuation">;</span>
		<span class="token keyword">this</span><span class="token punctuation">.</span>options <span class="token operator">=</span> options<span class="token punctuation">;</span>
    <span class="token comment">// 每创建一个watcher就让id自增 </span>
		<span class="token keyword">this</span><span class="token punctuation">.</span>id <span class="token operator">=</span> id<span class="token operator">++</span><span class="token punctuation">;</span>
		<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getter</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> Watcher<span class="token punctuation">;</span>
</code></pre></div><h2 id="生成虚拟dom"><a href="#生成虚拟dom" class="header-anchor">#</a> 生成虚拟dom</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// src/render.js</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> createElement<span class="token punctuation">,</span> createTextNode <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&quot;./vdom/index&quot;</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">renderMixin</span><span class="token punctuation">(</span><span class="token parameter">Vue</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token class-name">Vue</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">_v</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">text</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token comment">// 创建文本</span>
		<span class="token keyword">return</span> <span class="token function">createTextNode</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> text<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
	<span class="token class-name">Vue</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">_c</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token comment">// 创建元素</span>
		<span class="token keyword">return</span> <span class="token function">createElement</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>arguments<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
	<span class="token class-name">Vue</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">_s</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">val</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// 转化成字符串</span>
		<span class="token keyword">return</span> val <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">?</span> <span class="token string">''</span> <span class="token operator">:</span> <span class="token keyword">typeof</span> val <span class="token operator">===</span> <span class="token string">'object'</span> <span class="token operator">?</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>val<span class="token punctuation">)</span> <span class="token operator">:</span> val<span class="token punctuation">;</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
	<span class="token class-name">Vue</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">_render</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'_render'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">const</span> vm <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
		<span class="token keyword">const</span> render <span class="token operator">=</span> vm<span class="token punctuation">.</span>$options<span class="token punctuation">.</span>render<span class="token punctuation">;</span> <span class="token comment">// 获取编译后的render方法</span>
		<span class="token comment">// 调用render方法生成vnode，在调用时自动对变量求值</span>
		<span class="token keyword">const</span> vnode <span class="token operator">=</span> <span class="token function">render</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>vm<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">return</span> vnode<span class="token punctuation">;</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>创建虚拟节点</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// src/vdom/index.js</span>
<span class="token comment">/* 
虚拟dom可以随意添加属性，ast是针对语法解析出来的，不能随意添加属性
*/</span>
<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">createTextNode</span><span class="token punctuation">(</span><span class="token parameter">vm<span class="token punctuation">,</span> text</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token keyword">return</span> <span class="token function">vnode</span><span class="token punctuation">(</span>vm<span class="token punctuation">,</span> <span class="token keyword">undefined</span><span class="token punctuation">,</span> <span class="token keyword">undefined</span><span class="token punctuation">,</span> <span class="token keyword">undefined</span><span class="token punctuation">,</span> <span class="token keyword">undefined</span><span class="token punctuation">,</span> text<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">createElement</span><span class="token punctuation">(</span><span class="token parameter">vm<span class="token punctuation">,</span> tag<span class="token punctuation">,</span> data <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token operator">...</span>children</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">// 如果是列表元素需要添加key属性，这里对key进行处理</span>
  <span class="token keyword">let</span> key <span class="token operator">=</span> data<span class="token punctuation">.</span>key<span class="token punctuation">;</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span>key<span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">delete</span> data<span class="token punctuation">.</span>key<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token keyword">return</span> <span class="token function">vnode</span><span class="token punctuation">(</span>vm<span class="token punctuation">,</span> tag<span class="token punctuation">,</span> data<span class="token punctuation">,</span> key<span class="token punctuation">,</span> children<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">function</span> <span class="token function">vnode</span><span class="token punctuation">(</span><span class="token parameter">vm<span class="token punctuation">,</span> tag<span class="token punctuation">,</span> data<span class="token punctuation">,</span> key<span class="token punctuation">,</span> children<span class="token punctuation">,</span> text</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token keyword">return</span> <span class="token punctuation">{</span>
    vm<span class="token punctuation">,</span>
		tag<span class="token punctuation">,</span>
		data<span class="token punctuation">,</span>
		key<span class="token punctuation">,</span>
		children<span class="token punctuation">,</span>
		text
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>app<span class="token punctuation">&quot;</span></span> <span class="token attr-name">a</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span>1</span> <span class="token attr-name">b</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span>2</span> <span class="token style-attr"><span class="token attr-name">style</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token style language-css"><span class="token property">color</span><span class="token punctuation">:</span>red<span class="token punctuation">;</span><span class="token property">font-size</span><span class="token punctuation">:</span>12px<span class="token punctuation">;</span></span><span class="token punctuation">&quot;</span></span></span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>span</span> <span class="token style-attr"><span class="token attr-name">style</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token style language-css"><span class="token property">color</span><span class="token punctuation">:</span>red<span class="token punctuation">;</span></span><span class="token punctuation">&quot;</span></span></span><span class="token punctuation">&gt;</span></span>{{name}} aa {{age}} haha<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span><span class="token punctuation">&gt;</span></span>hello<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>span</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><p>上面的代码生成的 vnode 大体如下：</p> <p><img src="/assets/img/4.457646e7.png" alt=""></p> <h2 id="生成真实dom元素"><a href="#生成真实dom元素" class="header-anchor">#</a> 生成真实DOM元素</h2> <div class="language-js extra-class"><div class="highlight-lines"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><div class="highlighted"> </div><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div><pre class="language-js"><code><span class="token comment">// src/init.js</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> compileToFunctions <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./compiler/index'</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> mountComponent <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./lifeCycle'</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> initState <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./state'</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">initMixin</span><span class="token punctuation">(</span><span class="token parameter">Vue</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token class-name">Vue</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">_init</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">options</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">const</span> vm <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
		vm<span class="token punctuation">.</span>$options <span class="token operator">=</span> options<span class="token punctuation">;</span> <span class="token comment">// 实例上有个属性$options表示的是用户传入的属性，可以通过vm.$options获取到用户传入的所有属性</span>

		<span class="token comment">// 初始化状态</span>
		<span class="token function">initState</span><span class="token punctuation">(</span>vm<span class="token punctuation">)</span><span class="token punctuation">;</span>

		<span class="token comment">// 有el属性的话，说明数据可以挂在到页面上</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span>vm<span class="token punctuation">.</span>$options<span class="token punctuation">.</span>el<span class="token punctuation">)</span> <span class="token punctuation">{</span>
			vm<span class="token punctuation">.</span><span class="token function">$mount</span><span class="token punctuation">(</span>vm<span class="token punctuation">.</span>$options<span class="token punctuation">.</span>el<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
	<span class="token class-name">Vue</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">$mount</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">el</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">const</span> vm <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
		<span class="token keyword">const</span> options <span class="token operator">=</span> vm<span class="token punctuation">.</span>$options<span class="token punctuation">;</span>
		el <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span>el<span class="token punctuation">)</span><span class="token punctuation">;</span>
    vm<span class="token punctuation">.</span>$options<span class="token punctuation">.</span>el <span class="token operator">=</span> el<span class="token punctuation">;</span>
		<span class="token comment">// 如果有render就直接用render，没有render，看看有没有template属性，如果也没有template属性的话，就直接找外部模板</span>
		<span class="token comment">// 如果没有render方法</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>options<span class="token punctuation">.</span>render<span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token keyword">let</span> template <span class="token operator">=</span> options<span class="token punctuation">.</span>template<span class="token punctuation">;</span>
			<span class="token comment">// 如果没有模板但是有el</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>template <span class="token operator">&amp;&amp;</span> el<span class="token punctuation">)</span> <span class="token punctuation">{</span>
				template <span class="token operator">=</span> el<span class="token punctuation">.</span>outerHTML<span class="token punctuation">;</span>
			<span class="token punctuation">}</span>
			<span class="token comment">// 将模板编译成render函数</span>
			<span class="token keyword">const</span> render <span class="token operator">=</span> <span class="token function">compileToFunctions</span><span class="token punctuation">(</span>template<span class="token punctuation">)</span><span class="token punctuation">;</span>
			options<span class="token punctuation">.</span>render <span class="token operator">=</span> render<span class="token punctuation">;</span>
			console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'render'</span><span class="token punctuation">,</span> render<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>

		<span class="token function">mountComponent</span><span class="token punctuation">(</span>vm<span class="token punctuation">,</span> el<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 组件挂载</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><div class="language-js extra-class"><div class="highlight-lines"><br><div class="highlighted"> </div><br><br><br><br><br><div class="highlighted"> </div><div class="highlighted"> </div><div class="highlighted"> </div><div class="highlighted"> </div><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div><pre class="language-js"><code><span class="token comment">// src/lifeCycle.js</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> patch <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./observer/patch'</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> Watcher <span class="token keyword">from</span> <span class="token string">'./observer/watcher'</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">lifecycleMixin</span><span class="token punctuation">(</span><span class="token parameter">Vue</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token class-name">Vue</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">_update</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">vnode</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'_udpate'</span><span class="token punctuation">,</span> vnode<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token comment">// 将虚拟节点转换成真实dom</span>
		<span class="token keyword">const</span> vm <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
    <span class="token comment">// 首次渲染需要用虚拟节点更新真实dom</span>
		vm<span class="token punctuation">.</span>$el <span class="token operator">=</span> <span class="token function">patch</span><span class="token punctuation">(</span>vm<span class="token punctuation">.</span>$options<span class="token punctuation">.</span>el<span class="token punctuation">,</span> vnode<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">mountComponent</span><span class="token punctuation">(</span><span class="token parameter">vm<span class="token punctuation">,</span> el</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">// 默认 vue 通过 watcher 来渲染，这个watcher可以叫做渲染watcher，每个组件都有一个渲染watcher</span>
	vm<span class="token punctuation">.</span>$el <span class="token operator">=</span> el<span class="token punctuation">;</span>
	<span class="token keyword">let</span> <span class="token function-variable function">updateComponent</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
		<span class="token comment">// 将虚拟节点 渲染到页面上</span>
		<span class="token comment">// vm._render() 返回虚拟节点</span>
		<span class="token comment">// vm._update() 将虚拟节点转换成真实节点</span>
		vm<span class="token punctuation">.</span><span class="token function">_update</span><span class="token punctuation">(</span>vm<span class="token punctuation">.</span><span class="token function">_render</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
	<span class="token keyword">new</span> <span class="token class-name">Watcher</span><span class="token punctuation">(</span>
		vm<span class="token punctuation">,</span>
		updateComponent<span class="token punctuation">,</span>
		<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
			<span class="token comment">// 回调函数</span>
		<span class="token punctuation">}</span><span class="token punctuation">,</span>
		<span class="token boolean">true</span>
	<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// true 表示这是一个渲染watcher</span>
<span class="token punctuation">}</span>
</code></pre></div><div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// src/observer/patch.js</span>
<span class="token comment">/* 
oldVnode 第一次是一个真实节点
*/</span>
<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">patch</span><span class="token punctuation">(</span><span class="token parameter">oldVnode<span class="token punctuation">,</span> vnode</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token comment">// 是否是真实的 DOM 节点</span>
	<span class="token keyword">const</span> isRealElement <span class="token operator">=</span> oldVnode<span class="token punctuation">.</span>nodeType<span class="token punctuation">;</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span>isRealElement<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">// 如果oldVnode是一个真实DOM，表示是初次渲染</span>
		<span class="token keyword">const</span> oldElm <span class="token operator">=</span> oldVnode<span class="token punctuation">;</span>
		<span class="token keyword">const</span> parentElm <span class="token operator">=</span> oldElm<span class="token punctuation">.</span>parentNode<span class="token punctuation">;</span>

    <span class="token comment">// 根据虚拟节点创建真实节点</span>
		<span class="token keyword">let</span> el <span class="token operator">=</span> <span class="token function">createElm</span><span class="token punctuation">(</span>vnode<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">// 将创建的节点插入到原有节点下面</span>
		parentElm<span class="token punctuation">.</span><span class="token function">insertBefore</span><span class="token punctuation">(</span>el<span class="token punctuation">,</span> oldElm<span class="token punctuation">.</span>nextSibling<span class="token punctuation">)</span><span class="token punctuation">;</span>
		parentElm<span class="token punctuation">.</span><span class="token function">removeChild</span><span class="token punctuation">(</span>oldVnode<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">// 把新创建的 el 替换成 vm.$el</span>
		<span class="token keyword">return</span> el<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token comment">// 根据虚拟节点创建真实节点</span>
<span class="token keyword">function</span> <span class="token function">createElm</span><span class="token punctuation">(</span><span class="token parameter">vnode</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token keyword">let</span> <span class="token punctuation">{</span> tag<span class="token punctuation">,</span> children<span class="token punctuation">,</span> key<span class="token punctuation">,</span> data<span class="token punctuation">,</span> text <span class="token punctuation">}</span> <span class="token operator">=</span> vnode<span class="token punctuation">;</span>
  <span class="token comment">// 如果是标签，有可能是组件，这里忽略</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> tag <span class="token operator">===</span> <span class="token string">'string'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		vnode<span class="token punctuation">.</span>el <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span>tag<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">// 更新属性</span>
		<span class="token function">updateProperties</span><span class="token punctuation">(</span>vnode<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">// 如果有子节点，需要进行递归操作</span>
		children<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">child</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
			<span class="token keyword">return</span> vnode<span class="token punctuation">.</span>el<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span><span class="token function">createElm</span><span class="token punctuation">(</span>child<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    <span class="token comment">// 处理文本节点</span>
		vnode<span class="token punctuation">.</span>el <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createTextNode</span><span class="token punctuation">(</span>text<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token keyword">return</span> vnode<span class="token punctuation">.</span>el<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 更新节点属性</span>
<span class="token keyword">function</span> <span class="token function">updateProperties</span><span class="token punctuation">(</span><span class="token parameter">vnode</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token keyword">let</span> newProps <span class="token operator">=</span> vnode<span class="token punctuation">.</span>data <span class="token operator">||</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">;</span> <span class="token comment">// 获取当前老节点中的属性</span>
	<span class="token keyword">let</span> el <span class="token operator">=</span> vnode<span class="token punctuation">.</span>el<span class="token punctuation">;</span> <span class="token comment">// 当前的真实节点</span>
	<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> key <span class="token keyword">in</span> newProps<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// 处理样式</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span>key <span class="token operator">===</span> <span class="token string">'style'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token comment">// 设置样式</span>
			<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> styleName <span class="token keyword">in</span> newProps<span class="token punctuation">.</span>style<span class="token punctuation">)</span> <span class="token punctuation">{</span>
				el<span class="token punctuation">.</span>style<span class="token punctuation">[</span>styleName<span class="token punctuation">]</span> <span class="token operator">=</span> newProps<span class="token punctuation">.</span>style<span class="token punctuation">[</span>styleName<span class="token punctuation">]</span><span class="token punctuation">;</span>
			<span class="token punctuation">}</span>
		<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>key <span class="token operator">===</span> <span class="token string">'class'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token comment">// 设置类名</span>
			el<span class="token punctuation">.</span>className <span class="token operator">=</span> newProps<span class="token punctuation">.</span>class<span class="token punctuation">;</span>
		<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
			<span class="token comment">// 给这个元素添加属性 值就是对应的值</span>
			el<span class="token punctuation">.</span><span class="token function">setAttribute</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> newProps<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
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